Found a motor for my car. It's really BOSS:D

tireburner163 · 10-30-2001, 11:38 PM

I guy down the road from where I live has a 1966 Ford pick-up that was his dad's. In the 70s his dad found got the engine from a smashed BOSS 302 in Texas. Now he loves that truck and would never sell it, BUT I might be able to talk him into selling the engine, because he is sorta in a bind for cash. I was thinking rebuild the engine, port the heads, add a edelbrock torker intake, a 800cfm carb, a cam, hedders, a T-5, and 4.11 gears. What type of HP would that make? Don't those engine rev to like 7,000 RPMs? If I remember my mustang history corectly the BOSS 302 had Clevland type heads that were the $hit, forged steel crank, forged rods and pistons. Is that corect? Just think about it my car painted silver or carcoal with a black BOSS 302 stripe over the hood and down the sides that breaks up into flames just before the rear tire....ahhhh..... so this is what hevean is like

------------------
THE SLO PONY
1992 Ford Mustand LX. 2.3 liter four-banger, auto. Future mods: V-8 swap.

Fly it loud, Fly it proud!!!

If it ain't broke, you ain't tryin hard enough

Rev · 10-30-2001, 11:59 PM

I think the Boss 302 would be really expensive to rebuild. Parts are not easy to come by. The advantage of these engines were 4 bolt mains and big ports in the heads making very high flowing heads. That was great for road racing engines that didn't need to do anything at the low end and needed only to run well at very high RPM.

These Boss 302's ran 3.89 rear axles with a 4 speed and were built to blast by the Z-28 305's which they did. They ran about 3500 at 70 mph. and peaked out at around 6000. They still didn't do too well in the 1/4 mile. Maybe high 14's.

There are some here that disagree with me on this. Some that know a lot, such as Unit. I still think that even a mild street car such as mine will blow the doors off of a stock Boss 302 in a 1/4 mile race.

Rev

------------------
'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.

[This message has been edited by Rev (edited 10-31-2001).]

90dpscoupe · 10-31-2001, 12:05 AM

I think they had a solid lifter cam, wich enabled them to rev that high, but not exactly educated on the boss 302? it probaly wouldnt be very streetable, but also you may want to hold on to that motor.

bigwhitecobra · 10-31-2001, 12:18 AM

I'd get the motor to build a Boss clone, but you would really hate to drive a car with that motor. It's like driving a Kenworth truck around town, you never get in the power band, and when you do, you've already ran out of road.

Now, if you put a Eaton blower on it, it would be much better around town. You'd have the mid-range that you'd be looking for. As a mild street motor, it just wouldn't be any fun to drive anywhere but Road America or something.

Powerwise, it would be about a 350-375rwhp motor. except your power curves would look like this: ........../`\

Peak power would come about 6000-6200, which would be ok, but from 1500-4500 you wouldn't see over 200hp. That's my guess anyway. Daily driver, no. Drag car, no. Kick *** show car, yes. Bragging rights, hell yeah!

Hope this helps some. Later.

[This message has been edited by bigwhitecobra (edited 10-31-2001).]

Unit 5302 · 10-31-2001, 02:47 AM

Peak power will depend on the cam. My uncle had no problems driving around town in his 1969 Boss 302. The Boss 302 is not expensive to build, mostly because there isn't much to build. The heads flow nearly 300cfm stock, there is no reason to port them. As far as the parts, they had a built on rev limiter at about 6000rpm. Forgot the exact number, but removing that is the first step in getting one of those engines to perform. Changing over to an electronic ignition and getting some good exhaust can do wonders for that engine. On an engine dyno a stock 1970 Boss 302 (slightly weaker all out) my uncle used as a reference made 364hp and 340lb/ft. Take into consideration the compression ratio on that engine was dropped to run on 87oct pump gas and you begin to understand just what kind of monsters the engines really were. The Boss 302 will put down 400hp on an engine dyno when setup near stock and properly tuned. 400hp is 400hp, regardless of whether the power peaks closer to 6000, or 4200 like the old 5.0HOs. You set your gear up to run quickly into the powerband, get a better ignition, a good cam, a good exhaust (stock Boss 302's had piddly 2") and tune that carb. You'll have a very powerful engine capable of revving to more like 8000rpm that will make well over 400hp. Even if the powerband moves high, we now have the luxury of 5spd overdrive gearboxes to keep the revs down.

On a side note yes, the Boss used forged internals but it only had 4 bolt mains on 2,3,and 4. The front main was 2 bolt. The Boss blocks are said to be stable to about 600hp or so.

A good Boss engine on the open market will sell for somwhere between 6000-8000.

Mercury · 10-31-2001, 04:06 AM

I wouldnt Port Boss heads...Collectors would Hunt you down and kill you.

Seriously, something rare like that, if it gets messed up, your missing one of the most Vital Boss 302 parts.

PKRWUD · 10-31-2001, 07:05 AM

Rev-

FYI: The base model Z28 and Boss both had 302's with an identical bore and stroke. In fact, they both had solid cams and were both conservatively rated at 290hp/290ft.lbs. The Z28 had 11:1 pistons and the Boss had 10.5:1 pistons. The 305 didn't show up until 1977.

Take care,
-Chris

------------------
Retired Moderator
MustangNet

My site: Peckerwoods Pit Stop

My teams site: Jim Porter Racing

RACECAR spelled backwards is RACECAR

HEY !!! Are you ASE Certified ??? If you are, ask me about iATN.

Unit 5302 · 10-31-2001, 07:39 PM

Wasn't the Chevy 302 a 327 with a 283 crank?

Rev · 10-31-2001, 08:05 PM

Yes those Z-28's were 302's. How dumb of me to make that error. The 305's were real dogs too weren't they.

Rev

------------------
'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.

SkarodoM · 10-31-2001, 09:50 PM

ahhh the dz302

a very sweet lil mill indeed

PKRWUD · 10-31-2001, 11:43 PM

Unit-
Yes, the 302 was a de-stroked 327. They took the leftover 1967 283 cranks and dropped them into their strongest 1968 327 blocks, added a solid cam and 11:1 pistons and ended up with an engine that reached it's peak hp @ 5800rpm and it's peak torque @ 4200 rpm, which was the highest peak torque rpm of any Chevy engine, big or small block. This engine was designed to get up to high rpms quickly, and to have lots of power when it got there. The Boss 302 had similar treatment. It reached it's peak torque @ 4300 rpm, while the regular 302 reached it's at 2600 rpm.

Take care,
-Chris

------------------
Retired Moderator
MustangNet

My site: Peckerwoods Pit Stop

My teams site: Jim Porter Racing

RACECAR spelled backwards is RACECAR

HEY !!! Are you ASE Certified ??? If you are, ask me about iATN.

Unit 5302 · 11-01-2001, 12:49 AM

My friends dad built a 302 using that method. Revved like crazy. Seemed to be a honkin little motor too. I'd much rather have the Boss though.

10-30-2001, 11:38 PM	#1
tireburner163 It's a lot like a race car Join Date: Aug 2000 Location: Meridian, MS Posts: 4,130	Found a motor for my car. It's really BOSS:D I guy down the road from where I live has a 1966 Ford pick-up that was his dad's. In the 70s his dad found got the engine from a smashed BOSS 302 in Texas. Now he loves that truck and would never sell it, BUT I might be able to talk him into selling the engine, because he is sorta in a bind for cash. I was thinking rebuild the engine, port the heads, add a edelbrock torker intake, a 800cfm carb, a cam, hedders, a T-5, and 4.11 gears. What type of HP would that make? Don't those engine rev to like 7,000 RPMs? If I remember my mustang history corectly the BOSS 302 had Clevland type heads that were the $hit, forged steel crank, forged rods and pistons. Is that corect? Just think about it my car painted silver or carcoal with a black BOSS 302 stripe over the hood and down the sides that breaks up into flames just before the rear tire....ahhhh..... so this is what hevean is like ------------------ THE SLO PONY 1992 Ford Mustand LX. 2.3 liter four-banger, auto. Future mods: V-8 swap. Fly it loud, Fly it proud!!! If it ain't broke, you ain't tryin hard enough

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10-30-2001, 11:59 PM	#2
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	I think the Boss 302 would be really expensive to rebuild. Parts are not easy to come by. The advantage of these engines were 4 bolt mains and big ports in the heads making very high flowing heads. That was great for road racing engines that didn't need to do anything at the low end and needed only to run well at very high RPM. These Boss 302's ran 3.89 rear axles with a 4 speed and were built to blast by the Z-28 305's which they did. They ran about 3500 at 70 mph. and peaked out at around 6000. They still didn't do too well in the 1/4 mile. Maybe high 14's. There are some here that disagree with me on this. Some that know a lot, such as Unit. I still think that even a mild street car such as mine will blow the doors off of a stock Boss 302 in a 1/4 mile race. Rev ------------------ '66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph 1/4 mi. [This message has been edited by Rev (edited 10-31-2001).]

10-31-2001, 12:05 AM	#3
90dpscoupe Registered Member Join Date: Jun 2000 Location: sanantonio, Tx, usa Posts: 1,407	I think they had a solid lifter cam, wich enabled them to rev that high, but not exactly educated on the boss 302? it probaly wouldnt be very streetable, but also you may want to hold on to that motor.

10-31-2001, 12:18 AM	#4
bigwhitecobra Huh? Whatcha said? Join Date: Oct 2000 Location: Fayetteville, NC Posts: 1,073	I'd get the motor to build a Boss clone, but you would really hate to drive a car with that motor. It's like driving a Kenworth truck around town, you never get in the power band, and when you do, you've already ran out of road. Now, if you put a Eaton blower on it, it would be much better around town. You'd have the mid-range that you'd be looking for. As a mild street motor, it just wouldn't be any fun to drive anywhere but Road America or something. Powerwise, it would be about a 350-375rwhp motor. except your power curves would look like this: ........../`\ Peak power would come about 6000-6200, which would be ok, but from 1500-4500 you wouldn't see over 200hp. That's my guess anyway. Daily driver, no. Drag car, no. Kick *** show car, yes. Bragging rights, hell yeah! Hope this helps some. Later. [This message has been edited by bigwhitecobra (edited 10-31-2001).]

10-31-2001, 02:47 AM	#5
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	Peak power will depend on the cam. My uncle had no problems driving around town in his 1969 Boss 302. The Boss 302 is not expensive to build, mostly because there isn't much to build. The heads flow nearly 300cfm stock, there is no reason to port them. As far as the parts, they had a built on rev limiter at about 6000rpm. Forgot the exact number, but removing that is the first step in getting one of those engines to perform. Changing over to an electronic ignition and getting some good exhaust can do wonders for that engine. On an engine dyno a stock 1970 Boss 302 (slightly weaker all out) my uncle used as a reference made 364hp and 340lb/ft. Take into consideration the compression ratio on that engine was dropped to run on 87oct pump gas and you begin to understand just what kind of monsters the engines really were. The Boss 302 will put down 400hp on an engine dyno when setup near stock and properly tuned. 400hp is 400hp, regardless of whether the power peaks closer to 6000, or 4200 like the old 5.0HOs. You set your gear up to run quickly into the powerband, get a better ignition, a good cam, a good exhaust (stock Boss 302's had piddly 2") and tune that carb. You'll have a very powerful engine capable of revving to more like 8000rpm that will make well over 400hp. Even if the powerband moves high, we now have the luxury of 5spd overdrive gearboxes to keep the revs down. On a side note yes, the Boss used forged internals but it only had 4 bolt mains on 2,3,and 4. The front main was 2 bolt. The Boss blocks are said to be stable to about 600hp or so. A good Boss engine on the open market will sell for somwhere between 6000-8000.

10-31-2001, 04:06 AM	#6
Mercury The Redneck James Bond Join Date: Sep 2000 Location: Fayetteville NC Posts: 1,707	I wouldnt Port Boss heads...Collectors would Hunt you down and kill you. Seriously, something rare like that, if it gets messed up, your missing one of the most Vital Boss 302 parts.

10-31-2001, 07:05 AM	#7
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Rev- FYI: The base model Z28 and Boss both had 302's with an identical bore and stroke. In fact, they both had solid cams and were both conservatively rated at 290hp/290ft.lbs. The Z28 had 11:1 pistons and the Boss had 10.5:1 pistons. The 305 didn't show up until 1977. Take care, -Chris ------------------ Retired Moderator MustangNet My site: Peckerwoods Pit Stop My teams site: Jim Porter Racing RACECAR spelled backwards is RACECAR HEY !!! Are you ASE Certified ??? If you are, ask me about iATN.

10-31-2001, 07:39 PM	#8
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	Wasn't the Chevy 302 a 327 with a 283 crank?

10-31-2001, 08:05 PM	#9
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	Yes those Z-28's were 302's. How dumb of me to make that error. The 305's were real dogs too weren't they. Rev ------------------ '66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph 1/4 mi.

10-31-2001, 09:50 PM	#10
SkarodoM Registered Member Join Date: Mar 2001 Location: Charlotte, NC Posts: 199	ahhh the dz302 a very sweet lil mill indeed

10-31-2001, 11:43 PM	#11
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Unit- Yes, the 302 was a de-stroked 327. They took the leftover 1967 283 cranks and dropped them into their strongest 1968 327 blocks, added a solid cam and 11:1 pistons and ended up with an engine that reached it's peak hp @ 5800rpm and it's peak torque @ 4200 rpm, which was the highest peak torque rpm of any Chevy engine, big or small block. This engine was designed to get up to high rpms quickly, and to have lots of power when it got there. The Boss 302 had similar treatment. It reached it's peak torque @ 4300 rpm, while the regular 302 reached it's at 2600 rpm. Take care, -Chris ------------------ Retired Moderator MustangNet My site: Peckerwoods Pit Stop My teams site: Jim Porter Racing RACECAR spelled backwards is RACECAR HEY !!! Are you ASE Certified ??? If you are, ask me about iATN.

11-01-2001, 12:49 AM	#12
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	My friends dad built a 302 using that method. Revved like crazy. Seemed to be a honkin little motor too. I'd much rather have the Boss though.