306 rebuild questions.

chris91LX · 12-11-2002, 05:14 PM

I was going to build a 306 over the winter and had a couple questions.

How much, if any, hp gain over the stock 302 short block can I expect with a balanced assembly with the stock crank and rods, in a decked, align honed and .030 over block?

How much torque increase can I expect and will the curve change dramatically?

I've pulled 293rwhp @ 5600 and 316rwtq @ 3900 on my stock 80k mile block with Edel. 6032 heads, TFS Stage 1 cam, ported Cobra intake, 70mm tb, 76mm maf, 24lb inj., 190lph fp, MSD 6AL, pullies, LT headers, o/r h and 2 1/2" cat back. I'll be swapping the top half to the 306 bottom end.

I'll be using either used TRW pistons or the Summit kit with the Speed Pro pistons and rings. Any opinions on rebuild kits are welcome as well. TIA

sn95gt19 · 12-11-2002, 05:19 PM

i made the mistake of building a 306, just build a 331 or 347 just about the same price. check on e bay and piece together a brand new setup, i got a 347 w/eagle forged crank $200 (new) eagle h beam rods $150 (new) probe forged pistons (new) $369. damn good setup for what i spent. i bought it all from e bay stores not individuals. just my .02

302 LX Eric · 12-11-2002, 05:20 PM

While you're in there, have you considered dropping in a stroker package?

E

chris91LX · 12-11-2002, 05:31 PM

I just figured I could build a 306 for alot cheaper. I thought I could pick up 20-30 hp, but all I've been hearing is I won't pick up much of anything. I got a deal on the block that came out of a buddies 332 stroker, he's upgrading to a mexican block. I figured a Summit rebuild kit (~$400), a used crank and rods (under $200), and then I could sell my shortblock and do the whole thing for a few hundred bucks. The best prices I've seen on the strokers is like $1000.

BLACK85GT · 12-11-2002, 07:30 PM

Quote:

Originally posted by sn95gt19
i made the mistake of building a 306, just build a 331 or 347 just about the same price. check on e bay and piece together a brand new setup, i got a 347 w/eagle forged crank $200 (new) eagle h beam rods $150 (new) probe forged pistons (new) $369. damn good setup for what i spent. i bought it all from e bay stores not individuals. just my .02

wow. You picked up the eagle crank and rods that cheap? Where exactly? Do you have the name of the store?. I have never used ebay.

12-11-2002, 05:14 PM	#1
chris91LX Registered Member Join Date: Oct 1998 Location: Suburban Chicago, Hanover Park Posts: 695	306 rebuild questions. I was going to build a 306 over the winter and had a couple questions. How much, if any, hp gain over the stock 302 short block can I expect with a balanced assembly with the stock crank and rods, in a decked, align honed and .030 over block? How much torque increase can I expect and will the curve change dramatically? I've pulled 293rwhp @ 5600 and 316rwtq @ 3900 on my stock 80k mile block with Edel. 6032 heads, TFS Stage 1 cam, ported Cobra intake, 70mm tb, 76mm maf, 24lb inj., 190lph fp, MSD 6AL, pullies, LT headers, o/r h and 2 1/2" cat back. I'll be swapping the top half to the 306 bottom end. I'll be using either used TRW pistons or the Summit kit with the Speed Pro pistons and rings. Any opinions on rebuild kits are welcome as well. TIA __________________ My Ford Club http://www.midwestfords.org/ Best time N/A 12.9 @ 107 1.711 60' 125 shot - 12.04 @ 113 1.59 60'

12-11-2002, 05:19 PM	#2
sn95gt19 motors done......woohooo Join Date: Mar 2002 Posts: 799	i made the mistake of building a 306, just build a 331 or 347 just about the same price. check on e bay and piece together a brand new setup, i got a 347 w/eagle forged crank $200 (new) eagle h beam rods $150 (new) probe forged pistons (new) $369. damn good setup for what i spent. i bought it all from e bay stores not individuals. just my .02 __________________ 95gt lazer red (98 cobra clone) Rice Haters Club Member #116

12-11-2002, 05:20 PM	#3
302 LX Eric or '331 LX Eric' Join Date: Jan 1999 Location: Columbus, Ohio Posts: 2,142	331 or 347? While you're in there, have you considered dropping in a stroker package? E __________________ 1991 5.0 LX Coupe - 40,750 miles 331 cu. in. / Tremec 3550 / BFG Drag Radials 12.22 @ 114.31 mph - w/1.89 60'

12-11-2002, 05:31 PM	#4
chris91LX Registered Member Join Date: Oct 1998 Location: Suburban Chicago, Hanover Park Posts: 695	I just figured I could build a 306 for alot cheaper. I thought I could pick up 20-30 hp, but all I've been hearing is I won't pick up much of anything. I got a deal on the block that came out of a buddies 332 stroker, he's upgrading to a mexican block. I figured a Summit rebuild kit (~$400), a used crank and rods (under $200), and then I could sell my shortblock and do the whole thing for a few hundred bucks. The best prices I've seen on the strokers is like $1000. __________________ My Ford Club http://www.midwestfords.org/ Best time N/A 12.9 @ 107 1.711 60' 125 shot - 12.04 @ 113 1.59 60'

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