I have a 1969 Corvette Convertible 4 speed with the L46 motor 350/350. What parts would need to be changed if i wanted to put a 427 or 454 motor in this car? The car also has the factory side exhaust.

Asked by Jan 21, 2014 at 04:57 PM about the 1969 Chevrolet Corvette Convertible

Question type: Maintenance & Repair

1 Answer

13,585

Your Corvette from the factory did not come equipped to handle the heavier 427/454. First what is needed is the large block suspension springs. I think the shocks will need replacing, also. The motor is larger so some of the steering stiff will need repositioning. The entire front suspension geometry will need to be replaced with larger parts. The radiator will need to be larger, the hood will not fit so a new one is needed, factory or after market is your choice. The larger engine will have complex exhaust clearance issues. The connection to the side exhausts may be larger for the big block. If it's power you want, I built my 350/350 up to have more HP that a stock crate big block, with faster revs, and no modifications needed although I did do it. Consider a 400 crank (stroker kit) cam, heads, larger or dual carburetors, or even an EFI. I put in electric fans, larger radiator, dual quads, Edelbrock high flow heads, bored out 0.040, new 5 speed, 2 1/4 stainless exhausts to Flowmax mufflers, and Hooker long headers. It is faster than the 69 427s, except the L-88, and has beaten the first reintroduced Z06 Corvettes with 405 rwh. Oh yes, I think the transmission will need to be changed out with the larger engine. Compare the costs. Mine is around 445 HP. $12 k on a new motor and all extra parts. The old one had three major cracks, got a bare block 4 bold main 350 and had it professionally built by a person that builds NASCAR motors.

2 of 2 people found this helpful.

Your Answer

Add photo

Related Questions

Search Chevrolet Corvette Questions

Chevrolet Corvette Experts

#1 John Carson
John Carson
Reputation 2,240
#2 Vincent Parker
Vincent Parker
Reputation 1,390
#3 carGrrl
carGrrl
Reputation 1,370
View All

Related Models For Sale

Used Chevrolet Camaro
226 Great Deals out of 30,943 listings starting at $1,217
Used Ford Mustang
472 Great Deals out of 45,735 listings starting at $1,999
Used Dodge Challenger
184 Great Deals out of 24,169 listings starting at $8,800
Used Porsche 911
93 Great Deals out of 4,510 listings starting at $9,995
Used Dodge Charger
407 Great Deals out of 28,172 listings starting at $1,988
Used Mercedes-Benz SL-Class
42 Great Deals out of 2,825 listings starting at $3,500

Used Cars For Sale

2017 Chevrolet Corvette For Sale
5 Great Deals out of 10,513 listings starting at $46,241
2016 Chevrolet Corvette For Sale
7 Great Deals out of 1,452 listings starting at $44,775
2015 Chevrolet Corvette For Sale
4 Great Deals out of 683 listings starting at $40,999
2014 Chevrolet Corvette For Sale
5 Great Deals out of 810 listings starting at $39,990
2013 Chevrolet Corvette For Sale
10 Great Deals out of 389 listings starting at $24,975

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.