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NHRA 340 engine blueprint specs. #541222 11/30/09 04:41 PM 11/30/09 04:41 PM
Joined: Jan 2003 Posts: 1,620 MA R ragtop OP top fuel
ragtop OP top fuel R Joined: Jan 2003 Posts: 1,620 MA	Why does the NHRA list the 1971 340 at 11.8 comp. ratio and all pre 71 340s at the factory 10.5 C.R.? Thanks.

Re: NHRA 340 engine blueprint specs. [Re: ragtop] #541223 11/30/09 08:43 PM 11/30/09 08:43 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	68-71 all show the same blueprint specs. With 4.040" x 3.31" and 4.180" x .028" gasket, I still come up with 11.839:1 That's not counting .013" additional stroke and .070" allowable over bore. It's a possible mis-print on the specs.

Re: NHRA 340 engine blueprint specs. [Re: ragtop] #541224 11/30/09 09:50 PM 11/30/09 09:50 PM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	Quote: Why does the NHRA list the 1971 340 at 11.8 comp. ratio and all pre 71 340s at the factory 10.5 C.R.? Thanks. those specs were provide by the factory... also in the old days..LOL...the factory provide the cam specs which had a very long duration..so that anything less was legal. now nhra only limited the valve lift and does not check duration. the factory was just trying to give their team racers GOOD specs for their engines. Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

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