350 Heads and Cam

john66

Member
Hi:
I bought my 66 Impala project from a woman who's husband died while just getting started on it. He had pieces of the 350 engine he planned on using. The block is a four bolt main #3970010, he had new flat top pistons with four valve reliefs. (std) I still have to check if the block is ok at std. and doesn't need to be bored. The heads are 305 heads #378450 which he had sent out for machining. After checking the cr online it looks to me that the cr would be way too high for pump gas. Did I do it wrong or do I need different heads?
He had a Edelbrock Performer Intake Manifold with a 600 cfm Holly for it I planned on using. I will be getting headers for it and will be installing a 700R4 Trans.
I don't need a huge amount of power as I'll never race it, I just want it to sound good and maybe be able to light up the tires from a stand still if i want to. I just wand a good cruiser.
Basically I'm asking if I need different heads what number heads do i need that are readily available used and what would be a good mild cam for it. If you need more info please let me know.

P.S.
I like the way the guy thinks, the engine is in pieces, the body and interior need pretty much everything and the first thing he buys is new tires. sounds like something I would do.

Thanks
John
 
I think you meant # 376450.....75-81...262/267/305..6 or 7 exhaust bolt holes, 60cc chamber heads

heres a compression calculator

http://www.kb-silvolite.com/calc.php?action=comp

your compression ratio will be about 10:1-10.5:1 depending on head gasket used, deck height etc.

you didn,t mention converter stall speed or rear gear ratio but thats fairly high compression for those heads to be used with pump gas and those small valves won,t help either, youll want different heads , youll want to find 72cc-76cc heads with bigger valves and 170cc-180cc ports


viewtopic.php?f=52&t=727


the erson cam below gives a nice boost in power over the stock cam to a 350 matched to a stock rear gear and stock stall converter combo, in a heavy car like an impalla with no bad habits
E110020K

http://www.pbm-erson.com/store.php?catI ... parent=327
 
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