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1988 prelude circle track car

 
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Old 10-18-2015, 01:19 AM
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1988 prelude circle track car

Hey this my first post so im mechanicaly inclined i have a 88 prelude i race a 3rd mile asphalt oval so it went well it has the b20a3 sohc carbed engine. I might buy the b20a5 anyway the rings are bad so ima go thru it... Whats the best things to do for horsepower and durability... Motor should be out within next 2 days i want to do away with the 2 stock carbs n all vacuum and go to a holley 350 or 500.. Will a b20a5 head fit on b20a3 block well anything is appreciated i will be posting pics..
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Old 10-18-2015, 11:48 AM
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Re: 1988 prelude circle track car

Yes, a b20a5 head will bolt onto a b20a3 block. What are you planning to do for an intake manifold? Please do a lot of research before you remove the stock carbs. Here is a good place to start...
FAQ (Frequently Asked Questions), Common Repairs, etc - Honda Prelude Forum : Honda Prelude Forums

You might also consider going with dual Weber carbs instead of the Holley idea. Either will require a custom intake manifold, and the Webers will be easier it fit in that space.
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Old 10-19-2015, 12:05 AM
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Re: 1988 prelude circle track car

Yes, the B20A5 head will fit on the B20A3 block but....

Neither your intake or exhaust manifolds will fit the A5.
You will need to modify the A3 distributor to fit the A5, or do a complete PGMFI swap.
You will need to use the crank sprocket for the timing belt from the A5 because the different cam sprocket diameter.
The A5 bottom end is more stout and more suited for higher RPM than the A3.
If you change to PGMFI, it takes allot more than just the A5 head.

If you want to mis-match parts, you would be better off using an A5 bottom end with your A3 head. It wont provide the power gains you're after, but it will increase the durability and raise the RPM ceiling.

As far as the carbs go, you get the most improvement if you used one carb per cylinder. You can find a setup off an older super bike or just find two more stock carbs for your car. Then using your custom manifold, just mount them up in front of each cylinder. What you do with the vacuum lines is up to you. There have been backyard manifolds made for 4bbl carbs, but there have been no reports of performance increases.
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1988, b20a3, circletrack, honda prelude, racing


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