BBC with SBC frame mouts vs BBC mounts - Team Camaro Tech
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post #1 of 9 (permalink) Old Jul 23rd, 09, 01:23 PM Thread Starter
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JB
 
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BBC with SBC frame mouts vs BBC mounts

I recently found out that I've been running SBC 302 mounts since day one. Now, I know that the BBC mounts tilt the engine towards the passenger side, by about 1/2 inch, but it is my understanding that the SBC 302 mounts make the engine sit lower in the cradle.
At this point in the game, after having fitted the headers and manual steering box to my .600" raised port heads, I am wondering if it is worth the aggravation to get the correct mounts...I think even with the correct mount I'll still have to "hammer adjust" headers.
Anybody has seen the physical differences with a BBC in the car using SBC 302 mounts vs BBC mounts??
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post #2 of 9 (permalink) Old Jul 23rd, 09, 02:57 PM
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Re: BBC with SBC frame mouts vs BBC mounts

Ive had 350 small block frame mounts with my 427 in my 69 Camaro... When i installed the new motor BBC 498. I then installed the new frame mounts and motor mounts that seemed to give just enough clearance for my 2" Hooker Super Comp Headers without denting them at all. It also lined up my 4-speed Z-bar and centered the 7-blade clutch fan into the stock radiator and shroud.

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post #3 of 9 (permalink) Old Jul 23rd, 09, 08:39 PM
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Smile Re: BBC with SBC frame mouts vs BBC mounts

JB, The Big Block frame mounts will roll the engine to the passenger side about 1 inch at the carburetor stud. The transmission crossmember must also be changed and that will move the transmission tail 1/2" to the passenger side and 3/4" forward. The rumor that the 302 sits lower is not really true. The 302/350 frame stands were to allow more room for an 8" harmonic balancer at the sway bar. These mounts moved the engine slightly back and if anything, slightly TALLER, than the 307/327 frame mounts.

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
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post #4 of 9 (permalink) Old Jul 23rd, 09, 10:53 PM
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Re: BBC with SBC frame mouts vs BBC mounts

Tom....have to disagree with you. 302/350 is the lowest setup in the chassis by a fraction. 1/8 over big block and 1/4 over 307/327. My understanding was it was for hood clearance as well.
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post #5 of 9 (permalink) Old Jul 24th, 09, 08:23 AM Thread Starter
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JB
 
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Re: BBC with SBC frame mouts vs BBC mounts

Thanks guys, I think I'll end up ordering the correct mounts...I use a SWP and elec fan with an aftermarket rad, so these parts do not come into play for me...I did have to slightly ding up my 2" comp headers, and grind the manual box to make it fit (due to my raised port heads), but, if the correct mounts would allow me to install headers "sans dings" then I might just like that! I'm due for new headers...just couldn't see buying a new set to ding them again...
It'll throw a wrench at my plans to have my motor/trans and front clip back on over the week-end (I'm getting frustrated of having my front clip covered in my back yard)...but what's another week after having it there for the past 3 months lol!
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post #6 of 9 (permalink) Old Jul 24th, 09, 10:07 AM
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Re: BBC with SBC frame mouts vs BBC mounts

Quote:
Originally Posted by Vegas69 View Post
Tom....have to disagree with you. 302/350 is the lowest setup in the chassis by a fraction. 1/8 over big block and 1/4 over 307/327. My understanding was it was for hood clearance as well.
Well, you are partially correct... The difference in the Big Block to 302/350 "through" bolt height is about 1/4" on the tall mount. This is at a 45 angle, so that would equal 1/8" in height.

The difference between combined height between the 302/350 and the 307/327 is 3/16" at 45 or 3/32" (just over 1/8").

You can not mix the frame mounts and engine mounts... They won't bolt up.

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1

Last edited by TJS69; Jul 24th, 09 at 10:32 AM.
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post #7 of 9 (permalink) Old Jul 24th, 09, 11:03 AM Thread Starter
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Re: BBC with SBC frame mouts vs BBC mounts

^ that's my other concern: I bought moroso solid mounts...and to be honest I can't remember the number (not stamped where I can see it on the engine either)...they physically fit on the stands (width wise) but I believe the hole location is the same as the stock ones I had on...just hate to spend 80 bucks to then find out it's not working out...
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post #8 of 9 (permalink) Old Jul 24th, 09, 01:00 PM
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Re: BBC with SBC frame mouts vs BBC mounts

Go to www.pozziracing.com and take some measurments.
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post #9 of 9 (permalink) Old Jul 25th, 09, 06:16 AM
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Re: BBC with SBC frame mouts vs BBC mounts

are the repo mounts any good? Most of the stuff sucks.
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