Re: Headwork for 300HP D??
 

I purple power tank all my motor parts overnight. Power washed look very nice. Stuff will eat up your hands wear gloves.

Re: Headwork for 300HP D??
 

how hard do you power wash? i dont have a power washer....yet

Re: Headwork for 300HP D??
 

go to the car wash then. I spent around 15 minutes on blocks

Re: Headwork for 300HP D??
 

That is kind of true in relation to most B-series heads, but for our economic D-series heads they can use a bit of work rounding out the 90 degree bend in the exhaust ports. You can always improve flow by smoothing out the edges left by the casting process.

There was a few good write-ups on DIY head porting floating around on the internet.

Re: Headwork for 300HP D??
 

Very untrue. The exhaust ports on dohc vtec heads re-act huge to work. Expect 25 whp+ . All Honda heads are hardly maxed out that is just the truth.

Re: Headwork for 300HP D??
 

also the diy port work write ups are for v8 heads not the efficent Honda heads. Gains in port work from an unexperinced person just grinding expect nothing. Guy behind a flowbench etc is when power is found.

Re: Headwork for 300HP D??
 

Stock B18C5 are pretty damn efficient and as you probably know dont respond as well as a D to your average bolt ons... but that doesnt mean teh head is worked to the max

Re: Headwork for 300HP D??
 

Actually the write-up was for a B16A, and I should have been more specific. They aren't any where near maxed out, especially the VTEC exhaust ports , because of that conjugal routing against the coolant passages in the head but they don't require major reformation of passages like some VW and V8 heads. You won't see gains from hogging out the ports in stupid proportion. Mainly what Honda heads benefit from is forming passages that promote venturi effect in specific places, like exiting the port where the exhaust gas should be accelerated into the header where the venturi effect should be continued, or even better right into a turbine ;)

Re: Headwork for 300HP D??
 

I'll have to try this when i get to working on the block. My local machine shop hot tanked the head for fifteen bucks. I let the rocker arms soak in acetone for about an hour then just wiped them clean with a rag. They came out pretty good.

After reading all the replies I think a stock rebuild is the best way to go for now, although I'm still tempted to get a cam.

Re: Headwork for 300HP D??
 

Duh chris, don't you know anything? ----, you'd think you havn't been doing this for years or anything.