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Username Post: 1968 Bel Air Engine Identification        (Topic#359272)
Pennguy3523 
Newbie
Posts: 2
Pennguy3523
Loc: Pennsylvania
Reg: 12-28-19
12-28-19 07:39 AM - Post#2783065    

I recently inherited a 68 Bel Air from my uncle. It had been stored in his basement since the 80's. The fender badging is for a 307 and it has a 2BBL Rochester carb. My Dad and I pulled the engine and powerglide out of it. The casting number on the left rear of the block is 3914660 and the stamping on the front is TO1IHJ. The heads are both 3917290 casting number. Is it a 307 or a 327? Will it have to be torn down to check the bore to make an id?



 


59fins 
Member #212 "19th Year" Gold Supporting Member
Posts: 2283
59fins
Age: 59
Loc: Surprise Az USA
Reg: 04-07-00
12-28-19 11:38 AM - Post#2783080    
    In response to Pennguy3523

http://outintheshop.com/faq/casting/castings2 .html
https://www.mortec.com/castnum.htm
www.Google.com "sbc casting numbers" and you can choose which site has best info

Bill H.
67 Impala SS




 
Double Aught 
Contributor
Posts: 340

Loc: SW America
Reg: 09-28-11
12-28-19 04:44 PM - Post#2783098    
    In response to 59fins

That first link is great. OP has a 327




 
Pennguy3523 
Newbie
Posts: 2
Pennguy3523
Loc: Pennsylvania
Reg: 12-28-19
12-28-19 05:35 PM - Post#2783100    
    In response to Double Aught

Yeah, everything I come up with says its a 327. The 2BBL Rochester threw me off. I couldn't find the Bel Air with a 327/2BBL combination. Thanks for helping a classic car newbie.



Edited by Pennguy3523 on 12-28-19 05:39 PM. Reason for edit: No reason given.

 
59fins 
Member #212 "19th Year" Gold Supporting Member
Posts: 2283
59fins
Age: 59
Loc: Surprise Az USA
Reg: 04-07-00
12-29-19 08:20 PM - Post#2783172    
    In response to Pennguy3523

We were all Newbie's at one time

Bill H.
67 Impala SS




 
HK1837 
Newbie
Posts: 36

Reg: 09-18-15
01-15-20 02:56 PM - Post#2784440    
    In response to Pennguy3523

As you suspect you have a 327. By the casting number on the block and the heads and the engine plant assembly code you have a 1968 L73 327. All Tonawanda cast block and heads and assembled at Tonawanda. These were 4BBL (Quadrajet), 9:1, 250hp. Lots of literature incorrectly quote them as 8.75 (including a lot of Chevrolet literature), but they are 9:1. When you think about it they have to be higher than 8.75:1 as the 1968 307 with the identical heads is 8.75:1. The extra compression is why the 1968 low comp 4BBL 327 is 250hp and the 1967 version (with 75cc heads) is 240hp. They are basically the same engines otherwise.
Whenever the 307 was removed the person who fitted the 327 must have used the intake and carby off the 307.
The distributor should be 1111150 if it is off the L73 originally.
The only difference bewteen your engine (originally) and a 1968 L30 275hp 327 from Tonawanda is the L30 would have had 040 heads fitted and a different distributor (291 heads if assembled at the Flint V8 engine plant).



Edited by HK1837 on 03-30-20 02:55 PM. Reason for edit: No reason given.

 


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