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 Blocks / Cranks/ Rods and Pistons
 need help with my Pontiac 400 build heres what im
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showroom
Tribal Scout

USA
3 Posts

Posted - 23 Jan 2015 :  05:52:18 AM  Show Profile  Reply with Quote
My problem is compression, this will be my first engine I'm building ...

My plan is to bore the block 60 over
Use a 4.25 stroke crank & 6.8 rods
I want zero deck the block the heads are 1970 Pontiac 16 short vavle but im changing that ,to 2.11 titanium intake 1.77 stainless exhaust with 1.65 roller rockers , the cam will be a custom grinded one in 600 lift range

The piston I was thinking was a dish with valve relief to lower compression maybe inverted dome but I fear that will cause more compression...any input on my build will be grateful.

Transmission will be a 4l80e
Rear end will be a either 3.55, or 3.90
Car weighs 4000 pounds


cortcomp
Coyote

USA
5335 Posts

Posted - 23 Jan 2015 :  08:47:06 AM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
If the trans is OD as i recall, at 3.55 you'll be about 2300-2500 rpms at highway cruise, with the 3.90s you'll be at almost 3k or so (depending on tire size, etc.)

If you go with a cam that has no soggy bottom end (hard to kill on a pontiac anyways) i personally feel you'll like the 3.55s with OD better. I ahd 3.42s and 3.90s and while the 3.90s woke up the first three gears, i wasn't having so much fun on the highway.
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