350 Engine Specs needed - Team Camaro Tech
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post #1 of 10 (permalink) Old Dec 19th, 05, 09:23 AM Thread Starter
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Unhappy 350 Engine Specs needed

I need to know some specs for the 1969 350/300 horse engine...
Crankshaft: does it have a one piece or 2 piece end piece? Large or small journal type? (Pls give both specs)
Camshaft: what is the type used on this engine?
Can I go with roller rockers & still have no clearance problems with the stock aluminum LT1 valve covers?
Pistons: can I go with domed or must they be flat-top?
Any help appreciated! And Merry Christmas!

NOTE: I have the original 350 4-bolt main block & I am rebuilding it for my car, but it is a bare block....

Salerno
1969 SS Garnet Red Convertible
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post #2 of 10 (permalink) Old Dec 19th, 05, 10:06 AM
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Wes
 
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Re: 350 Engine Specs needed

1) Two-piece rear main seal
2) Large journal
3) Very small cam,..something like .410 lift. You'll want to replace it with something bigger.
4) I don't know of any roller rockers that will fit under the alum. finned valve covers, but the Comp Cams Roller Tips fit fine. Good pieces,..I recommend them.
5) There are one thousand choices for pistons. Originally, your L-48 (SS-350) came with flat-tops with small valve reliefs. With the 186 heads, they made 10.25 compression. If you go a larger cam, you can up the compression a bit, but not much with iron heads.

Good luck!
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post #3 of 10 (permalink) Old Dec 19th, 05, 12:57 PM
 
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Re: 350 Engine Specs needed

Roller rockers will not fit under LT-1 and stick with the flat tops.The 11-1 piston will give you severe detonation even with a big duration cam. I a 70 Z it is not enjoyable to drive with only 4 degrees advance and a carb jetted rich.I built an engine for a customer in a 70 z and used forged flat tops with the 186 castings[64cc] and it was much more user freindly........www.hardcoreparts.ca
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post #4 of 10 (permalink) Old Dec 19th, 05, 04:33 PM
 
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Re: 350 Engine Specs needed

Quote:
Crankshaft: does it have a one piece or 2 piece end piece? Large or small journal type? (Pls give both specs)
Two-piece rear main seal
Large journal type - Mains 2.4479-2.4488 Rods 2.099-2.100 (these are factory specs)
Quote:
Camshaft: what is the type used on this engine?
The 69' used a .390 lift in. & .410 ex. w/ 112 Lobe Center (not positive it may have been 114)
Quote:
Can I go with roller rockers & still have no clearance problems with the stock aluminum LT1 valve covers?
I have done this before but it required either spacers or gaskets. FeliPro FPP-1604 (Thickness (in): 0.313) work very good for this. I haven't checked actual clearance but it cleared a .500 lift cam with Harland Sharp rockers.
Quote:
Pistons: can I go with domed or must they be flat-top?
I'm not sure of what your building or your goal is. Are you trying to copy a 1969 350/300 horse engine or just want that power? 1 hp per ci is easily obtainable and street-able these days. What heads are you using? This and other factors such as block deck height are required to make this assessment.

Quote:
And Merry Christmas!
Same to you
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post #5 of 10 (permalink) Old Dec 19th, 05, 05:56 PM
 
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Thumbs up Re: 350 Engine Specs needed

Ah, yes, the great little old, -929 hy-cam!!

195/202, 112/108, .390"/.410" lifts.

It's a shame GM didn't stick, say a stock type Performer cam in the old 295hp and 300hp/350 motors instead of the -929 for just that little bit more power increase due to no other reason than it's size increase over the 300hp/327 motor that ran the same cam....

pdq67



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post #6 of 10 (permalink) Old Dec 20th, 05, 12:01 PM Thread Starter
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Re: 350 Engine Specs needed

Thanks to all of you very much, and Merry Christmas!
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post #7 of 10 (permalink) Old Dec 20th, 05, 12:07 PM Thread Starter
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Re: 350 Engine Specs needed

yes, I'm trying to copy the 350 cid/300 hp engine. I have the ultra rare 388
4-bolt main block (original) and the original 186 heads; all are date matched.
The heads are getting stainless valves, bronze guides job; wondered about going to roller rockers... The block has never been bored & the machinist says a .030 job will clean everything up just fine. I'm not a 80+ mph driver but want that horsepower there...
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post #8 of 10 (permalink) Old Dec 20th, 05, 06:54 PM
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Don
 
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Re: 350 Engine Specs needed

I am using comp magnum roller tips on my stock finned covers but took some of the drippers off. Some of the vent baffles may have to be squeazed a little sometime but not always. Stay narrow and it will work.

Don
TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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post #9 of 10 (permalink) Old Dec 20th, 05, 07:01 PM
 
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Re: 350 Engine Specs needed

what do u mean ultra rare 388 block....i just dont know what ur talking bout ty merry christmas
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post #10 of 10 (permalink) Old Dec 20th, 05, 07:04 PM
 
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Re: 350 Engine Specs needed

buy the way like the name sounds like a mobster name
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