'76 302 Bronco engine questions

QuantumMotorsports · 05-04-2003, 12:53 PM

Can anyone tell me anything about what a '76 Bronco 302 engine would have as far as lifter type and head ports and valve sizes? I could get a 302 out of a 76 bronco for a really nice price and am thinking of tearing it down and putting a new cam and intake on it, possibly heads. I have a set of E6 heads that I could grind the emissions bumps off of and have a valve job done on them. I was thinking if I could get a 4 barrell intake and carb and a cam that it might be a cheap motor that would run okay. What kind of cam and lifters are in that motor? hydraulic flat tappet probably? I could do a roller conversion on it and run a motorsport cam I guess. What do you guys think. Keep in mind I'm wanting to keep cost down by probably using either the 76 heads or the E6 heads I have. I don't mind getting out a die grinder and going after the heads. Which one would have bigger valves? Anyone know? Let me know what you guys think.

84LX89GT · 05-05-2003, 12:32 AM

What i know about the '76 bronco 302 is that it has cast pistons, hydraulic flat-tappet lifters, and the standard heads used on all late 70's vehicles with 1.78 intake and 1.46 exhaust valves, which is the same as the E6 heads or E7 heads for that matter. The '76 heads themselves are poor, but are better than the '86's high swirl heads. If you have to choose between the two, i'd go with the '76's heads. As far as the block goes, it has a two piece rear main seal (likes to leak/blowout) but has a fairly thick casting compared to the thin-cast 80's blocks.
What vehicle are you putting this in?

05-04-2003, 12:53 PM	#1
QuantumMotorsports Registered Member Join Date: Jul 2000 Location: Norman, Oklahoma, USA Posts: 597	'76 302 Bronco engine questions Can anyone tell me anything about what a '76 Bronco 302 engine would have as far as lifter type and head ports and valve sizes? I could get a 302 out of a 76 bronco for a really nice price and am thinking of tearing it down and putting a new cam and intake on it, possibly heads. I have a set of E6 heads that I could grind the emissions bumps off of and have a valve job done on them. I was thinking if I could get a 4 barrell intake and carb and a cam that it might be a cheap motor that would run okay. What kind of cam and lifters are in that motor? hydraulic flat tappet probably? I could do a roller conversion on it and run a motorsport cam I guess. What do you guys think. Keep in mind I'm wanting to keep cost down by probably using either the 76 heads or the E6 heads I have. I don't mind getting out a die grinder and going after the heads. Which one would have bigger valves? Anyone know? Let me know what you guys think. __________________ Michael Black QuantumMotorsports Norman, OK 1984 LX Hatch 306 w/ TRW forged flat toppers, Comp Cams Magnum 292H, GT40P heads w/ 3 angle valve job, .550 lift springs, Angus Racing Roller Rockers, Weiand Stealth Intake, Holley 4150 650cfm carb, MAC 1 5/8 Long Tubes, Single Chamber Flowmasters, 91' T5 w/ Pro 5.0 shifter, Turbo Coupe 8.8 Rear w/ 3.55 gears, QA1 Motorsports tubular K member, no interior except steering wheel and seat. Coming soon: 6 or 8 point cage, Fuel Cell, Weld Draglites

05-05-2003, 12:32 AM	#2
84LX89GT Mustangs Join Date: Jul 2000 Posts: 1,938	What i know about the '76 bronco 302 is that it has cast pistons, hydraulic flat-tappet lifters, and the standard heads used on all late 70's vehicles with 1.78 intake and 1.46 exhaust valves, which is the same as the E6 heads or E7 heads for that matter. The '76 heads themselves are poor, but are better than the '86's high swirl heads. If you have to choose between the two, i'd go with the '76's heads. As far as the block goes, it has a two piece rear main seal (likes to leak/blowout) but has a fairly thick casting compared to the thin-cast 80's blocks. What vehicle are you putting this in? __________________ 2005 Suzuki Hayabusa GSX1300-R 1980 Ford Thunderbird - 255 V8 ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain hi-po Mack Truck hood emblem 1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc. Sold 02/06/04 1989 Mustang GT ET: 13.304@102.29 mph (5-24-03) Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)

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